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UNIT 32 OIL HEAT EXAM | QUESTIONS &
ANSWERS (VERIFIED) | LATEST UPDATE |
GRADED A+
If a technician inspects the interior of a combustion chamber and finds large quantities of unburned oil, he would correctly conclude that ____. a. The nozzle may be too small. b. The stack switch may be defective. c. The primary control unit may be defective. d. Both b and c are correct. Answer : D A special tool has been designed to help remove and install nozzles from the burner. It is called a nozzle wrench and it ____. a. has an outer wrench that holds the burner in place, while the inner wrench holds the nozzle b. minimizes the chance of cracking the porcelain c. can only be used on semi-hollow cones d. both a and b Answer : D
The number engraved on the nozzle indicates ____. a. how many gallons of air per hour the nozzle will deliver regardless of input pressure b. how many foot pounds of pressure must be used to properly tighten the nozzle c. how many gallons of oil per hour the nozzle will deliver at a given input pressure d. the stock number of the part Answer : C Improper combustion can lead to ____. a. excessive carbon monoxide production b. smoke condition around furnace c. wasted oil d. all of the above Answer : D The grade of fuel usually used in residential and light commercial units is ____. a. No. 1 b. No. 2 c. No. 4 d. No. 6 Answer : B
Answer : C The stack switch or stack relay ____. a. starts the fan motor when the thermostat calls for heat b. shuts down the burner if it does not sense heat in the flue products c. cuts off the ignition after the flame has been established d. all of the above Answer : B A condensing oil furnace operates at a higher efficiency because part of the heat output is ____. a. sensible heat b. latent heat c. superheat d. sub-cooling Answer : B To make combustion efficiency tests, a hole must be made ____. a. in the flue pipe after the draft control b. in the flue pipe before the draft control c. over the fire at the observation door d. under the draft hood
Answer : B In a single-stage fuel oil pump, the oil is fed to the burner by capillary action. Answer : False Nozzles can be cleaned to remove any carbonization by using a very fine wire brush. Answer : False For complete combustion and higher efficiency, the oil spray and the air flow off the blast tube both turn counter-clockwise. Answer : False Oil burner nozzles are designed and rated at 100 psig nozzle pressure. Answer : True The tangential slots in an oil burner nozzle are to control the volume of oil flow through the nozzle. Answer : True
. After several seasons, buried oil tanks are
The heat content of one gallon of No. 2 fuel oil ? Answer : 140,000 btu/gal. ---------- is the amount of carbon left in a sample of oil after it is vaporized, changed from a liquid to a vapor, by boiling it. Answer : Carbon Residue In a two _--- configuration one pipe is the supply and the other acts as the return. Answer : Pipe
. Oil lines can be constructed of _____, ______,______ pipe connected with malleable fittings. Answer : Copper,Wrought Iron or Steel ____ and ____ pipes should be pitched toward the tank opening to prevent the formation of oil traps. Answer : Fill ,Vent The __________ is an oil piping component that allows a one-pipe system to function as a two-pipe system.
Answer : Oil DE-aerator __________ is a colorless and odorless gas. Answer : Carbon Monoxide Modern oil burners are referred as high pressure burners, as the oil is delivered through the burner at a pressure of about ___ psi. Answer : 100 There are two main types of oil pumps used on gun-type burners, ______ and _______ Answer : Single Stage,Two Stage_ Fuel pumps are equipped with _______ at the inlet to prevent particulate matter from entering the pump. Answer : Screens How can a technician tell the difference between an up-flow furnace and a down-flow furnace? Answer : Down-flow air is drawn in from the top & forced out at the bottom duct work is located below the
a. CAD cell b. nozzle c. electrodes d. ignition transformer e.flame retention ring f. stack switch Answer : B What generates approximately 10,000 volts needed for spark a. CAD cell b. nozzle c. electrodes d. ignition transformer e.flame retention ring f. stack switch Answer : D What devices that will shut burner down in case the burner doesn't fire a. CAD cell b. nozzle c. electrodes d. ignition transformer e.flame retention ring
f. stack switch Answer : F What creates turbulence in the air-oil mixture to increase efficiency a. CAD cell b. nozzle c. electrodes d. ignition transformer e.flame retention ring f. stack switch Answer : E What changes its resistance depending on the amount of light it senses a. CAD cell b. nozzle c. electrodes d. ignition transformer e.flame retention ring f. stack switch Answer : A What is insulated with ceramic to prevent electrical ground a. CAD cell
